This is true, when I slid off my motor scooter into oncoming traffic and got hit by a car at roughly 50kmh, the first two things that came to my mind were:
1. Do my legs still work? Answer was yes (huge relief).
2. Would I be able to continue a fist fight right now, like Jason Statham would in a movie?
I would have said yes, I even tried to get up immediately but the guy that hit me was terrified and told me to stay down so I did.
What wasn't fun was not being able to walk without crutches for 2 months after, but in the moment with the adrenaline I felt pretty ok, I even walked myself to the ambulance.